# ex2ab08 - 27 Questions, 6 pages name (required) _...

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27 Questions, 6 pages name (required) ___________________ Extrapolation (Models) 1. (4pts) Class and the book described 5 examples of extrapolation, listed below. For which of those was the extrapolation eventually replaced by observations suggesting that the original extrapolation was incorrect? MTF A) a chemical’s maximum exposure threshold at 1 millionth of the LD50 dose in a suitable rodent model B) fetal alcohol syndrome C) rodent models of cancer D) risk of second-hand tobacco smoke 2. (3pts). Four graphs of extrapolation were illustrated in lecture and the book. To which types of extrapolation do the graphs apply? MTF A) extrapolation across species (fish to humans) B) extrapolation across doses C) extrapolation across related hazards Errors in Data 3. (4pts) Two samples of opinion from the same student body differ but the difference is not statistically significant. To what type of error do we attribute the difference? One answer only . A) Sampling B) Bias C) RPA D) Human and technical E) None 4. (4pts) Pre-election polls often use a particular medium for contacting people (e.g., landline phones). Although polls typically involve thousands of participants, and multiple polls are taken, their results often differ by large margins and in the same direction from the election results. What type of error accounts for the difference between voter opinions measured by polls and the voter opinions in the actual election? One answer only . A) Sampling B) Bias C) RPA D) Human and technical E) None 5. (4 pts) Charmin advertises 500 sheets of toilet paper per roll. A competitor decides to check out the claim, but instead of counting the sheets, takes the following shortcut. The competitor measures the length of 5 sheets to the nearest 1/6 inch, multiplies it by 100 and compares it to the length of the entire roll. The entire roll comes out 7 inches short of the calculated length for 500 sheets, and a single sheet is 4 inches long. The competitor thus claims fraudulent advertising by Charmin , but an actual count reveals that there were indeed 500 sheets in the roll. What type of error accounts for the difference between the calculated number of sheets and the actual number of sheets? ( one answer only ) A) Sampling B) Bias C) RPA D) Human and technical E) None 6. (4 pts) A survey of several hundred men and women between the ages of 20 and 40 finds that 4/5 of women do not like to spend Sunday watching football, whereas half the men do prefer this activity. The difference is observed in a follow-up survey. What type of data error is indicated by the consistent difference between the sexes in preference for watching football on Sunday? ( one answer only ) A) Sampling B) Bias C) RPA D) Human and technical E) None Bio301D Exam 2; 15 Oct 2008 1 of 6

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name _________________ 7. (5 pts) A customer complains that prices charged at the Far West HEB grocery store are often different than the
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## This note was uploaded on 12/20/2010 for the course BIO 301D taught by Professor Bull during the Spring '08 term at University of Texas at Austin.

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ex2ab08 - 27 Questions, 6 pages name (required) _...

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